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  1. richerdick32

    power flow ac systems

    Hopefully someone can explain this to me. In a ac system that can import and export power. what is going on with the waveform of current and voltage as it moves from importing to exporting power. it cannot be a simple reversal of current flow, which would be easy to understand as its AC. im sure...
  2. richerdick32

    Bonding of covers

    We have some large motors that have covers over the slip rings, the covers are removable using a standard panel key, should the covers have a bonding wire between the covers and the generator? I know electrical panel doors should be bonded? If a bonding wire is required what size should it be...
  3. richerdick32

    apc inverter output

    Hi, I want to measure the current output from a UPS. I seem to remember that there is a reason that you can't use a standard current clamp on inverter outputs as it will not give a true reading. I am assuming that the output from the ups will be some sort of PWM waveform? could somebody please...
  4. richerdick32

    Circuit protection

    Hi sounds like a simple question. is ok to use a switch rated at 16a in a circuit protected by a 16 a breaker, or does the switch rating need to be under that of the breaker, the expected load is only 6A
  5. richerdick32

    RCD protection

    Am I correct in thinking that if a rcd feeds a transformer, then anything connected to the secondary of the transformer will not be protected by the rcd and another rcd is required to provide protection
  6. richerdick32

    sbubbers

    Hi Am I correct in saying that the snubber circuits on the power transistors of an AC drive help to prevent undesired switching of the power transitors. we have a fault and I am considering whether it is worth changing the snubber modules?
  7. richerdick32

    Panel wiring

    Hi, I work for a company who has proposed for me to make alteration to a 24v dc control circuit. I have looked at the proposed alteration and can see from the drawings that the current circuit has a 50A breaker feeding several other smaller breakers between 4A and 10A. These feeds are routed...

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